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n(A) = 40, n(B) = 50, n(A ∪ B) = 71 and n(A ∪ B)' = 0. Find n(A ∩ B).
n(A ∩ B') = 15, n(A' ∩ B) = 20. Find n(A ∩ B).
In a town 50% people read newspaper A and 70% read news paper B, while 10% didn't read any type of newspaper. If 60,000 people read both type of newspaper, find total population of town.
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